Furnace tilt lift door and seal



April 22, 1952 L. s. LONGENECKER FURNACE TILT LIFT DOOR AND SEAL 6 Sheets-Sheet 1 Filed Jan, 21. 1949 Levi 5. Longenec/rer HIS ATTORNEYS April 22, 1952 L. s. LONGENECKER 2,594,138

FURNACE TILT LIFT DOOR AND SEAL.

Filed Jan. 21, 1949 6 Sheets-$heet 2.

IN V EN TOR.

L e v/' 5. Longenec/rer BY uluuf l ww H/S ATTORNEYS April 1952 L. s. LONGENECKER FURNACE TILT LIFT DOOR AND SEAL 6 Sheets-Sheet 3 Filed Jan. 21, 1949 .5 E N, w R m T A w H B \5 9 2 3 5 5 5 .m

April 1952 s. LONGENE'CKER 2,594,188

FURNACE TILT LIFT DOOR AND SEAL Filed Jan. 21, 1949 6 Sheets-Sheet 4 IN VEN TOR. L e w 5. L anger; ec/rer HIS ATTORNEYS April 22, 1952 1.. s. LONGENECKER FURNACE TILT LIFT DOOR AND SEAL 6 Sheets-Sheet 5 Filed Jan. 21, 1949 INVENTOR Lew S. Longenecker H/S ATTORNEYS April 22, 1952 s. LONGENECKER FURNACE TILT LIFT DOOR AND SEAL 6 Sheets-Sheet 6 Filed Jan. 21, 1949 IN VEN TOR. L e w 5. L on gene q/rer Patented Apr. 22, 1952 UNITED STATES PATENT OFFICE,

8 Claims.

This invention relates to furnace structures of the all-door front wall type and more particularly to tilt lift doors for such furnaces and seals for closing the clearance gaps between such doors and between the end doors and the door jambs.

Patent 2,045,662 issued to me on June 30, 1936, discloses a furnace of the all-door front wall type having tilt lift doors equipped with seals for closing such clearance gaps. Each of these seals comprises a frame having a long leg which bears against the ofi furnace side of two adjacentdoors and overlaps the clearance gap therebetween, and a short leg which projects toward the furnace and lies on top of such doors in overlapping relation to the top of such gap.

This short leg which lies on top of such doors is carried by that door of the pair which is raised ahead of the other, or by both such doors when they are raised at the same time and speed.

A furnace having an all-door front wall, having tilt lift doors and seals of the type described above is also disclosed in an application Serial No. 659,014 filed by me on April 2, 1946, which application has now matured as Patent No. 2,494,713, dated January 1'7, 1950.

These prior seals are counterweighted in an attempt to keep them from falling in the event they become dislodged from the tops of the doors during operation, and while they have been effective in closing the clearance gaps, they have given much trouble and have been a more or less constant source of danger. counterweighting the seals is not the solution of the problem, and an object of this inventionis to produce an improved and safe door and seal construction for tilt lift doors of the all-door front wall type of furnace.

Another object is to produce an improvedseal for closing the clearance gap between adjacent doors and between the end doors and the door jambs of an all-door front wall type of furnace equipped with tilt lift doors.

A further object is to produce improved sealingmeans for the clearance gaps between vertically movable furnace doors of the tilt lift type.

A still further object is to produce sealing means for the clearance gap between two adjacent vertically movable furnace doors of the tilt lift type and an improved door for co-operating with such sealing means in the sealing of such gap whereby such sealing means can be carriedby and secured to one such door in such manner as to adjust itself when one such door 2 is tilted and lifted independently of the other door.

Another object is to produce an improved refractory lined sealing means for closing the vertically extending gap between adjacent vertically movable furnace doors.

These and other objects I attain by means of the structures described in the specification and illustrated in the drawings accompanying and forming part of this application.

In the drawings:

Figure 1 is a more or less diagrammatic view in side elevation of two furnace doors of the tilt lift type equipped with a seal closing the clearance gap therebetween. One such door is shown in closed position and the other in partially open or raised position;

Fig. 2 is a view similar to Fig. 1, but in which both doors are closed;

Fig. 3 is a more or less diagrammatic view in front elevation of an all-door front wall furnace structure equipped with three tilt lift doors and four seals embodying this invention. In this view, one door is shown closed and the other two partially raised;

Fig. 4 is a View in front elevation of a furnace door and two seals carried thereby embodying this invention;

Fig. 5 is a top plan view of the door and seals of Fig. 4;

Fig. 6 is a sectional view taken on line VI-VI of Fig. 4;

Fig. '7 is an enlarged detail view of the upper part of the two doors and seal of Fig. 1;

Fig. 8 is an enlarged fragmentary view showing a portion of the upper parts of the door and seal structures of this invention;

Fig. 9 is a top plan view of those parts of the 7 two door and seal portions shown in Fig. 7;:

Fig. 10 is a view taken on line XX of Fig. 8;

Fig. 11 is a top plan view of the seal for the clearance gap between the tops of two adjacent doors of the tilt lift type embodying this invention;

Fig. 12 is a view in side elevation of the seal member shown in Fig. 11;

Fig. 13 is a sectional view taken on line XIII- XIII of Fig. 11;

Fig. 14 is a sectional view taken on line XIV- XVI of Fig. 11;

Fig. 15 is a perspective view of one of the regular blocks or tiles used to line the cast shell of the seal of this invention;

Fig. 16 is a perspective view of one of the special blocks or tiles used in making the seal lining;

The furnace chosen for the purpose of illustrating this twenties" is disclosed'in'l figure. 3 and comprises an alldoor front wall structure having a charging opening which extends from sill 25 to the bottom of lintel 26 and from the inner face of jamb 21 to the inner face. of jamb 2B. This opening is controlled by three tilt lift doors a, b and c which are adapted to -be manipulated by mechanisms such as disclosed in; my said Patent No. 2,494,713. 'Eachof the doors a; b and 0, extending along each of its vertical edges on its off furnace side, is provided with an angle member. .9 an a h of th lambs. 2i. and 8. provided with a similar angle member. anglemem-bers are arranged on opposite sidesof each of. the. clearance aps. 3!). existing between adjacent doors. and; between, the end door a. and

c and jambs 21 and 28 to form channels'for. the. seals which, an entirety are numbered 3i.

Each of the doors a .and ,c, is. provided with two seals which are adapted to close the four. clear.- ance gaps; two betweenthecenter door 12 and doors a and c and two between end'doors wand c and jambsZ] and 28.

Each seal 3.1: comprisesa channel-shapedcast steel shell having 'flat parallel side walls 32-32 provided with inwardly projecting pairs of'sectionaI key ribs or..flanges.33 which extend upwardly from horizontally extending. cross members.

Keyed in place by key members 33.33 and supported on cross. member' 3.4.2 arev interlocking refractoryblockslor tiles'35 and 35a. (Figs. and 16) which are provided." with side. slots '36. which co-operate with keys 3.3: to lock each block into the sealshell.

Each cross bar 34 carries three blocks or tiles; the two lowero'nes being regular tiles. 35Iand-the upper. onebeing a spe'cialtil'e 3.5m These special tiles are either specially formed orare'regular tilesthat have portions. broken away to decrease the height of the inne ncorner portionsfof v the body behind "grooves as as shown in Fig. '16 to permit them to be inserted in place in front-of cross members (see Fig. 18-).

Interlocking ofthe individual blocks or tiles is accomplished by means of the interfitting triangular'ton'gues 31 with the triangular-grooves 38. Such interloclging'i's broadly'disclosed-in a' number of patents issued to mes-uch asPatents Nos. 2,387,594; 2.240.190? 2,126,901; 2-;0i,'66 1-;' 2,024,649 and 1,874,321.

The'outer face of each blockor tile terminates in the same plane as-the outer dg'esio f: the

walls 32- 32. of the seal casting.

Each of the furnace doors a, b and 0 com;

gated design substantially-as disclosed iri Patent 2,387,594 issued to me on October 23, 1945. Each of these doors is preferably operated meters means adjacent. each end. of the top of. the doorhese.

4 tom which is straight across from side to side so as to receive and co-operate with the cylindrical surface of a sealing roller 40.

Sealing roller 40, the detailed construction of which is disclosed in Figs. 11 to 14 inclusive and will be later described, is mounted for rotation on a bearing pin 4| which projects laterally from one end and is preferably formed as a unitary part of a support arm 42 having adjacent its opposite end a cylindrical;crossgriiember 43 which parallels such bearing pin.

Cross member 43 at its distal end has a reduced end portion 44 and bearing pin 4| at its distal end has a reduced portion 45. Reduced portions 44 and 45 snugly fit within circular holes drilled for their reception in a support arm 46 which parallelssupport arm 42 and is held in operative relation thereto by means of a bolt 41 which extends. through atubular spacer member 48 as in said application and insaid'Patentf2,387,594,

is provided. with. adepression. 39;. at, each such end; eaohsuch. depression having-a circularbo'tposition and the seals are in clearance, gap se bolted as at $2 to cross mem e -town e;ceng

prises a main one-piece steel casti'ng Qf co'rruwhich surrounds such bolt and is positioned between'suppor-t arms '42 and.

Side members or walls 32-of the sealcastings, have cars 59- which extend upwardly. abgve ,l tops of the doors when such doors arein clo ing position. Ears 49 are slotted as at 49a 8) te -loosely receive cylindrical cross, men; r :33- which serves as the pivot pin fontl-iesealing roller assembly shown in Figure 11:. r

A member 55 connects ears nland; extends; above. the tops ofthe same (Fig. 8)" and rves limit tilting of the roller assembly awayfrom the; furnace so that its center. oimass when. the.seal is in vertical'position is alwayson the fur e side of the pivotal point of the roller. asse This arrangement makescertain that theseal'ln roller is always in sealing position when; the doors defining the gap to be sealed; are. closed.

Each seal 3! is suspended from its do, 1- its door jamb, as the. casemay be, by a flexible-sup-{ port which permits. tilting movement of; such seal with relation to the door or. door. jambtov which it is secured. This tilting movement "s. limited by flexible means secured. to the seal adjacent its upper end and to the doononjambat a point adjacent itstop.v Thev fleiri-ble sup r'iift, for. each seal preferably comprises I a chain 51 having its upperfend secured by means of an adjustment bolt 52 toabracket 53. see -airs; the door or the door jamb. Eachbolt lizrifspro vided with an adjusting nut and a ,loclnutwhich, together are numbered 54 (Fig. 4).. The lower end of each chain 5] is securedtoa bracket 55 a which isboltedv as at,56 to a pad 51 formedon the cast shell ofthe seal. Eachlchain il thus forms a floating support for seal 3 T t g'" movement of each seal relative to theldoo or jamb to which it is secured is limited by ache-in. 58,h aving one end secured to the top o f'thedopr as at 59 and the other endsecured toan. angle emb 60 as a n l m mber ai il f plate member BM which closes slots 430: are

nects ears as and is provided with; an arm 3- which extends partially around a? member 64 secured to and 'e'iitendingupwardly ab ve thei door top. Arm lie limits movement;offthefseal laterally away from the door when theoiff door side of the seal is unconfinedas when the door carrying the seal-is raised above the adjacent} door or door jamb as the case may be.

The doorjambs 21 and 28 have the same inclination tothevertical as the. doors when in closedposition..' resting against the furnace,

iii lintel-I The chains permit independent tilting of the doors to and from vertical position.

The seals for closing the clearance gaps between doors a and c and the jambs can, if desired, be secured to the jambs instead of to doors a and c, and the seals for the clearance gaps between doors a and b or b and 0 can be carried by door I) or one can be carried by door b and the other by door 0 or door a, as desired. In fact, the possibility of a number of different arrangements of seals for closing the gaps will be a parent.

If the seals for closing the gaps between doors a and c and the jamb are carried by the jambs, the door ends of the chains will be secured to the jambs instead of the door and a member corresponding to member 94 will be secured to the top of each jamb to cooperate with member 63.

With the arrangement of doors and seals disclosed in Figure 3, the sealing rollers 49 of the seals attached to door 0 are resting within depressions 39 of door 0; doors b and c being in vertical position having been righted before being raised to the position shown. Door a which is closed, is resting in inclined position against the furnace and roller seal 43 for closing the top of the clearance gap between doors a and b has been swung up by door b and is riding on the channel member 29 attached to and forming part of door 21; seal 3! for the clearance gap between doors a and I) having been moved to vertical position by door I).

What I claim is:

1. The combination with two vertically movable furnace doors arranged side by side and which when closed are supported in inclined position against the furnace and must be righted before being raised, of a seal for closing the clearance gap between such doors and which comprises a member adapted to lie against the off furnace side of such doors and overlap such gap when the doors are closed, an agent hinged to the upper part of such member and which when such doors are closed is adapted to lie on top of such door in overlapping relation to the gap between the door tops, and means anchoring such member to one such door whereby such member and such agent are carried by such door as the same is raised and lowered.

2. A structure as defined in claim 1 in which that part of the agent which is arranged in overlapping relation to the gap between the tops of such doors comprises a roller having a horizontal axis which parallels the plane of the furnaceface of the doors.

3. A structure as defined in claim 1 in which the means anchoring the member to one of the doors is flexible and is so arranged as to permit relative tilting movement between such member and the door to which such member is anchored.

l. A structure as defined in claim 3 in combination with flexible means for limiting such tilting movement.

5. A structure as defined in claim 1 in which that part of such agent which is arranged in overlapping relation to the gap between the tops of such doors comprises a roller, and in which the top of each door is provided with a curved W seat for receiving such roller.

6. ihe combination with a vertically movable furnace door which when closed is supported in inclined position against the furnace and must be righted before being raised, of a door jamb at one end of the opening controlled by such door and having the same inclination to the vertical as said door when said door is in closed position, a seal for closing the clearance gap between such door and jamb and which comprises a member adapted to lie against the oif furnace side of both such door and jamb and overlap such gap when such door is closed, an agent hinged to "the upper part of such member and which when such door is closed is adapted to lie on the top of such door and such jamb in overlapping relation to the top of such gap, and means anchoring such member to such jamb and being constructed and arranged to permit tilting of such member with relation to such iamb when such door is raised.

'7. A structure as defined in claim 6, in which the means for anchoring the member to the lamb comprises flexible members which are so arranged to permit relative tilting movement between the member and such jamb.

8. A structure as defined in claim 6, in which said agent comprises a roller and in which the top of the jamb and the top of the door are each provided with a curved seat for receiving such roller.

LEVI S. LONGENECKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,045,661 Longenecker June 30, 1936 2,045,662 Longenecker June 30, 1936 2,327,130 Russell Aug. 17, 1943 2,387-594 Longenecker Oct. 23, 1945 

